Harmless treatment device for traditional Chinese medicine extraction wastewater

Abstract

The invention relates to an innocent treatment device for traditional Chinese medicine extraction wastewater. The innocent treatment device comprises a water collecting tank, a flocculation sedimentation tank, a pre-acidification adjusting tank, a UASB tank, a biological contact oxidation tank, a secondary sedimentation tank, a biological aerated filter and a clean water tank which are communicated in sequence, a grillage machine is erected at the water inlet end of the water collecting tank, a flocculation box is arranged on the flocculation sedimentation tank, a flocculating agent is contained in the flocculation box, an adjusting box is arranged on the pre-acidification adjusting tank, and hydrolytic acidification bacteria are contained in the adjusting box; the treatment device further comprises a sludge concentration tank, the sludge concentration tank is communicated with the UASB tank, the flocculation sedimentation tank and the secondary sedimentation tank to collect sludge in the UASB tank, the flocculation sedimentation tank and the secondary sedimentation tank, and the sludge concentration tank is communicated with the water inlet end of the water collecting tank to enable supernate in the sludge concentration tank to enter the water collecting tank.

Description

Technical Field

[0001] This application relates to the technical field of traditional Chinese medicine production, and in particular to a device for the harmless treatment of wastewater from the extraction of traditional Chinese medicine. Background Technology

[0002] Wastewater generated during the extraction of traditional Chinese medicine mainly comes from the washing of medicinal materials, equipment cleaning, tank washing wastewater, and alkaline decoction.

[0003] Currently, wastewater generated during the extraction of traditional Chinese medicine first passes through a mechanical screen to remove large suspended solids and floating matter from the filtrate before flowing into a collection tank. Water quality and quantity are adjusted, and simple pre-aeration prevents sedimentation. The effluent from the collection tank enters a flocculation sedimentation tank, where acid is added to adjust the pH value of the influent to ensure the normal operation of subsequent systems. Flocculants are also added for flocculation and sedimentation, removing some organic matter, biotoxic substances, and color. The effluent from the flocculation sedimentation tank enters a UASB reactor. The reactor uses an umbrella-shaped water distribution device to prevent clogging and ensure uniform wastewater distribution. Through contact with a large amount of granular sludge, the wastewater undergoes four stages: hydrolysis, acidification, acid production, and methanogenesis, degrading most of the organic matter into CH4 and CO2. The UASB effluent then enters a biological contact oxidation tank. Under the aeration of a blower, soluble organic pollutants in the wastewater are adsorbed by activated sludge and decomposed by the microbial community living on the activated sludge, thus purifying the wastewater. The effluent then enters a secondary sedimentation tank for sludge-water separation. The remaining sludge is discharged into the sludge thickening tank, and part of it is returned to the aerobic tank; the effluent from the secondary sedimentation tank enters the micro-flocculation sedimentation tank, where the concentration of organic matter and suspended solids in the effluent is further reduced through flocculation and sedimentation; the effluent from the flocculation sedimentation tank enters the aerated biological filter, where organic matter is further removed through biochemical treatment and filtration, and the effluent is discharged after meeting the standards in the clear water tank.

[0004] The filtrate from Chinese herbal medicine residue contains a large amount of lignin, cellulose, pectin, and some alkaloids. These macromolecular substances can easily affect the settling performance of sludge in the UASB tank, thus affecting the treatment effect of the UASB tank. Summary of the Invention

[0005] To address the issue that the large amounts of lignin, cellulose, pectin, and some alkaloids in the filtrate of traditional Chinese medicine residues do not easily affect the settling performance of sludge and thus the treatment effect of UASB tanks, this application provides a device for the harmless treatment of wastewater from the extraction of traditional Chinese medicine.

[0006] This application provides a device for the harmless treatment of wastewater from the extraction of traditional Chinese medicine, which adopts the following technical solution: A device for harmless treatment of wastewater from the extraction of traditional Chinese medicine includes a water collection tank, a flocculation sedimentation tank, a pre-acidification and conditioning tank, a UASB tank, a biological contact oxidation tank, a secondary sedimentation tank, an aerated biological filter, and a clear water tank connected in sequence. A bar screen is installed at the inlet end of the water collection tank, a flocculation box is installed on the flocculation sedimentation tank, the flocculation box contains flocculant, and an adjustment box is installed on the pre-acidification adjustment tank, the adjustment box contains hydrolyzing acidifying bacteria. The treatment device also includes a sludge thickening tank, which is connected to the UASB tank, flocculation sedimentation tank and secondary sedimentation tank to collect sludge from the UASB tank, flocculation sedimentation tank and secondary sedimentation tank. The sludge thickening tank is connected to the inlet of the water collection tank to allow the supernatant in the sludge thickening tank to enter the water collection tank.

[0007] Furthermore, the processing apparatus also includes: A softening sedimentation tank is located between a water collection tank and a flocculation sedimentation tank, and the softening sedimentation tank is connected to the water collection tank and the flocculation sedimentation tank, and the softening sedimentation tank is also connected to a sludge thickening tank. The pH adjustment tank is used to adjust the pH of the filtrate from the drug residue to 7.0±0.2. The pH adjustment tank is located between the UASB tank and the pre-acidification adjustment tank, and the pH adjustment tank is connected to the pre-acidification adjustment tank and the UASB tank.

[0008] Furthermore, the softening sedimentation tank includes: The mixing zone is connected to the outlet of the water collection tank. A feeding box is provided on the mixing zone, and the feeding box contains an alkaline substance. The flocculation zone is connected to the mixing zone. A feeding box is provided on the flocculation zone, and the feeding box contains flocculant. The separation zone is used to remove flocs, and the separation zone is connected to the flocculation zone and the flocculation sedimentation tank.

[0009] Furthermore, the separation zone employs a dissolved air flotation machine, which includes: An air flotation tank is connected to a flocculation zone, and an air flotation base is provided at the bottom of the air flotation tank. A drain pipe is connected to the air flotation tank. A scum collection tank is connected to the air flotation tank; A scraper is connected to the side wall of the flotation tank, and the scraper can move in a direction that is close to or away from the scum collection tank. The slag removal plate is connected to the side wall of the slag collection tank and abuts against the scraper. The side wall of the flotation tank is equipped with a transmission assembly for driving the scraper to move.

[0010] Furthermore, the transmission assembly is provided in two sets, with the two sets of transmission assemblies located on both sides of the scraper, and each transmission assembly includes: There are two drive pulleys, both of which are rotatably connected to the side wall of the flotation tank, and the two drive pulleys are located at opposite ends of the flotation tank. The drive pulley is rotatably connected to the side wall of the scum collection tank, and the drive pulley is located on the side of the plane where the two drive pulleys are located that is away from the horizontal plane of the flotation tank. A drive belt is fitted around the drive pulley and the transmission pulley, and the scraper is connected to the drive belt through a connecting plate; A drive motor is fixedly connected to the outer wall of the flotation tank, and the output shaft of the drive motor is fixedly connected coaxially to one of the drive pulleys.

[0011] Furthermore, the connecting plate includes: Connecting sub-plate, which is fixedly connected to the scraper; The contact subplate is rotatably connected to the connecting subplate, and the contact subplate is rotatably connected to the transmission belt; A connecting spring connects the connecting sub-plate and the abutting sub-plate, and the angle between the abutting sub-plate and the connecting sub-plate is set under the action of the connecting spring force.

[0012] Furthermore, the slag removal plate moves in a direction that is close to or away from the slag collection tank and away from the side wall of the flotation tank, and the side wall of the slag collection tank is provided with a moving component for driving the slag removal plate to move back and forth.

[0013] Furthermore, the flocculation zone uses polyferric sulfate as a flocculant.

[0014] Furthermore, the flocculation sedimentation tank uses a cationic PAM aqueous solution as a flocculant.

[0015] In summary, the beneficial technical effects of this application are as follows: 1. The pre-acidification equalization tank allows the lignin, cellulose, pectin, and some alkaloids in the medicinal residue filtrate to be broken down and converted into small-molecule volatile fatty acids under the action of hydrolytic acidifying bacteria. This facilitates the decomposition by anaerobic bacteria in the subsequent UASB tank, thereby improving the problem that the large amount of lignin, cellulose, pectin, and some alkaloids in the medicinal residue filtrate can easily affect the sludge settling performance and the treatment effect of the UASB tank. 2. Polyferric sulfate is used as a flocculant in the flocculation sedimentation tank. Polyferric sulfate can hydrolyze under weakly alkaline to neutral conditions to produce a large number of polynuclear hydroxyl complexes, which can strongly adsorb suspended particles, colloids and softened calcium and magnesium precipitates in wastewater to form dense flocs with fast settling speed. In addition, the flocs formed by polyferric sulfate have a high specific gravity and excellent settling performance, and can be quickly separated by gravity, effectively reducing the total suspended solids and total organic pollutants in the water. 3. The cationic PAM aqueous solution in the flocculation zone of the softening sedimentation tank is mixed with the filtrate of the medicinal residue to treat the viscous organic colloids. Then, the inorganic suspended solids and precipitates are removed by the polyferric sulfate in the flocculation sedimentation tank. This creates excellent working conditions for the subsequent UASB tank and effectively solves the three major problems commonly encountered in the treatment of traditional Chinese medicine wastewater: scaling, clogging, and sludge stickiness. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the overall structure of the dissolved air flotation machine in the embodiments of this application; Figure 3 This is a partial schematic diagram of the dissolved air flotation machine in an embodiment of this application, showing the connecting plate; Figure 4 This is a partial schematic diagram of the dissolved air flotation machine in an embodiment of this application, showing the moving components and the rotating components; Figure 5 yes Figure 2 A magnified view of part A in the diagram.

[0017] Explanation of reference numerals in the attached figures: 1. Dissolved air flotation machine; 11. Flotation box; 111. Baffle plate; 112. Flotation tank; 1121. Abutment wheel; 1122. Connecting block; 1123. Baffle block; 113. Scum collection tank; 12. Scraper; 13. Scum removal plate; 14. Flotation base; 2. Transmission assembly; 21. Drive pulley; 22. Transmission pulley; 23. Transmission belt; 24. Transmission motor; 3. Connecting plate; 31. Connecting sub-plate; 32. Abutment sub-plate; 33. Connecting spring; 4. Moving assembly; 41. Moving gear; 42. Moving rod; 43. Moving rack; 44. Moving spring; 45. Rotating assembly; 451. Rotating motor; 452. Rotating rod; 453. Drive rod; 454. Rotating gear; 455. Rotating rack. Detailed Implementation

[0018] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] This application discloses a device for the harmless treatment of wastewater from the extraction of traditional Chinese medicine. (Refer to...) Figure 1The harmless treatment device for wastewater from the extraction of traditional Chinese medicine includes a collection tank, a softening sedimentation tank, a flocculation sedimentation tank, a pre-acidification adjustment tank, a pH adjustment tank, a UASB tank, a biological contact oxidation tank, a secondary sedimentation tank, an aerated biological filter, and a clear water tank, which are connected in sequence along the flow direction of the filtrate from the medicinal residue.

[0020] The collection tank is used to collect the filtrate from the medicinal residue. A bar screen is installed at the inlet end of the collection tank so that it can block and transfer large particles of suspension and floating matter in the filtrate.

[0021] The flocculation sedimentation tank is divided into a first flocculation tank and a sedimentation tank. The inlet of the first flocculation tank is connected to the outlet of the softening sedimentation tank, and the outlet of the first flocculation tank is connected to the inlet of the sedimentation tank. A flocculation box is mounted on the top of the first flocculation tank, and the flocculation box contains flocculant. In this embodiment, polyferric sulfate is used as the flocculant, and the amount of polyferric sulfate added in each liter of filtrate from the drug residue is 80-100 mg / L.

[0022] The inlet of the pre-acidification equalization tank is connected to the outlet of the sedimentation tank. An equalization box is fixedly mounted on the pre-acidification equalization tank, and the equalization box contains hydrolytic acidifying bacteria. In this embodiment, the amount of hydrolytic acidifying bacteria added per cubic meter of wastewater is 30-50 g / m³. The hydrolytic acidifying bacteria are composed of cellulose-decomposing bacteria and protein-decomposing bacteria, and the mixing ratio of cellulose-decomposing bacteria and protein-decomposing bacteria is 4:1.

[0023] A pH adjustment box is fixedly mounted on the pH adjustment tank, and the pH adjustment box contains a pH adjustment agent. In this embodiment, the pH adjustment agent is a sodium hydroxide aqueous solution with a mass concentration of 15% to adjust the pH of the drug filtrate to 7.0±0.2.

[0024] The inlet of the UASB tank is connected to the outlet of the pH adjustment tank. The inlet of the biological contact oxidation tank is connected to the outlet of the UASB tank. The inlet of the secondary sedimentation tank is connected to the outlet of the biological contact oxidation tank. The inlet of the aerated biological filter is connected to the outlet of the secondary sedimentation tank. The inlet of the clear water tank is connected to the outlet of the aerated biological filter and is used to collect clear water.

[0025] The inlet of the softening sedimentation tank is connected to the outlet of the collection tank. The softening sedimentation tank includes a mixing zone, a flocculation zone and a separation zone arranged sequentially along the flow direction of the filtrate from the medicinal residue.

[0026] The mixing zone is a mixing tank, which is connected to the outlet of the collection tank. A support frame is fixedly mounted on the mixing tank, and a feeding box is fixedly connected to the support frame. The feeding box contains an alkaline substance, which may be alkali or lime; in this embodiment, lime is used. A stirring mechanism is provided on the support frame to agitate the filtrate from the medicinal residue in the mixing tank. The stirring mechanism includes a stirring paddle and a stirring motor. The stirring paddle is rotatably connected to the support frame, the body of the stirring motor is fixedly connected to the support frame, and the output shaft of the stirring motor is coaxially fixedly connected to the stirring paddle.

[0027] The flocculation zone uses a flocculation tank, and a feeding box is fixedly mounted above the flocculation tank. The feeding box contains flocculant. In this embodiment, the flocculant is a cationic PAM aqueous solution, and the concentration of the cationic PAM aqueous solution is 0.1%~0.3%. The pectin, lignin and other colloids in the traditional Chinese medicine wastewater are generally negatively charged. Cationic PAM can quickly neutralize the colloidal charge and adsorb and bridge it with its high positive charge density to form large and loose flocs. These flocs are more likely to precipitate at high pH, ​​and cationic PAM can effectively reduce the stickiness of the colloids, making it easier to separate and scrape them off in the separation zone.

[0028] Reference Figure 2 The separation zone employs a horizontal flow dissolved air flotation (DAF) device, which includes a flotation tank 11, a flotation base 14, scrapers 12, and a scum removal plate 13. A partition 111 is fixedly connected inside the flotation tank 11, dividing it into a flotation pool 112 and a scum collection pool 113. The scum collection pool 113 is connected to the flotation pool 112. The side of the partition 111 facing away from the bottom of the flotation tank 11 has two inclined surfaces. The inclined surface closer to the flotation pool 112 is the first inclined surface, which slopes towards the bottom of the flotation pool 112. The inclined surface closer to the scum collection pool 113 is the second inclined surface, which also slopes towards the bottom of the scum collection pool 113. Multiple scrapers 12 are provided, and all scrapers 12 are mounted on top of the scum collection pool 113 and the flotation pool 112. The scraper 12 moves back and forth along the flotation tank 112 toward the scum collection tank 113. The top of the flotation tank 112 and the scum collection tank 113 are provided with a transmission assembly 2 for driving the scraper 12 to move.

[0029] The transmission assembly 2 is provided in two sets, which are respectively located on both sides of the scraper 12, and both transmission assemblies 2 are connected to the side wall of the scum collection tank 113 and the flotation tank 112 on the corresponding side of the scraper 12.

[0030] Both sets of transmission components 2 include drive pulleys 21, transmission pulleys 22, a transmission motor 24, and a transmission belt 23. There are two drive pulleys 21, which are rotatably connected to the side wall of the flotation tank 112. The transmission pulleys 22 are rotatably connected to the side wall of the scum collection tank 113, and the transmission pulleys 22 are located on the side of the plane containing the two drive pulleys 21 that faces away from the horizontal plane inside the flotation tank 112. The transmission belt 23 is sleeved on the outside of the drive pulleys 21 and 22. The transmission motor 24 is located outside the flotation tank 112, and its body is fixedly connected to the tank wall of the flotation tank 112. The output shaft of the transmission motor 24 is coaxially and fixedly connected to one of the drive pulleys 21 furthest from the transmission pulley 22. Both sides of the scraper 12 are connected to the corresponding side of the transmission belt 23 via connecting plates 3.

[0031] Reference Figure 2 and Figure 3 The connecting plate 3 includes a connecting sub-plate 31, an abutting sub-plate 32, and a connecting spring 33. The connecting sub-plate 31 is fixedly connected to the corresponding side of the scraper 12, and the connecting sub-plate 31 and the scraper 12 are set at an angle. When the connecting sub-plate 31 abuts against the straight section of the transmission belt 23, the free end of the scraper 12 extends inclined towards the bottom of the flotation tank 112. The abutting sub-plate 32 is rotatably connected to the connecting sub-plate 31 and the transmission belt 23. One end of the connecting spring 33 is fixedly connected to the connecting sub-plate 31, and the other end is fixedly connected to the abutting sub-plate 32. Under the elastic force of the connecting spring 33, the abutting sub-plate 32 and the connecting plate 31 are set at an angle. The angle between the abutting sub-plate 32 and the connecting plate 31 is not greater than 90° and not less than 45°. In this embodiment, the angle between the abutting sub-plate 32 and the connecting plate 31 is 90°. The first inclined surface is arranged parallel to the straight section of the transmission belt 23 between the transmission pulley 22 and the drive pulley 21 away from the transmission motor 24, and the distance between the two is less than the distance between the scraper 12 and the transmission belt 23. As a result, when the scraper 12 passes through the first inclined surface, the connecting spring 33 is compressed, and the sludge carried on the scraper 12 is squeezed, thereby reducing the water carried away by the sludge. At the same time, the sludge is compacted so that the sludge can be better separated from the scraper.

[0032] Reference Figure 2 and Figure 4The slag removal plate 13 is located in the slag collection tank 113, and the slag removal plate 13 moves in the direction of approaching or moving away from the partition plate 111. The slag collection tank 113 is provided with a moving assembly 4 for driving the slag removal plate 13 to move. Two sets of moving assemblies 4 are provided, one on each side of the scraper 12, and each set of moving assemblies 4 includes a moving gear 41, a moving rod 42, a moving rack 43, and a moving spring 45. The moving rod 42 is an elastic telescopic rod. In this embodiment, the moving rod 42 includes an inner rod and a sleeve rod. The inner rod is fixedly connected to the slag removal plate 13 and slides along the length of the sleeve rod. The end of the outer sleeve rod away from the slag removal plate 13 is fixedly connected to the moving rack 43. The movable rod 42 slides along the direction of approaching or moving away from the partition 111 and is connected to the side wall of the scum collection tank 113. The movable spring 45 is sleeved on the outside of the sleeve rod, with one end of the movable spring 45 fixedly connected to the sleeve rod of the movable rod 42 and the other end fixedly connected to the side wall of the scum collection tank 113. Under the elastic force of the movable spring 45, the scum cleaning plate 13 and the scraper 12 come into close contact. The movable gear 41 is rotatably connected to the outer wall of the scum collection tank 113 and meshes with the movable rack 43. The movable rack 43 is a half rack, that is, the movable rack 43 has no teeth at both ends. When the scum cleaning plate 13 comes into close contact with the scraper 12, the meshing state of the movable gear 41 and the movable rack 43 is released, so that the scum cleaning plate 13 can stay at the position where it comes into contact with the scraper 12.

[0033] A rotating assembly 45 is provided on the scum collection tank 113 to drive the moving gear 41 to rotate. The rotating assembly 45 includes a rotating motor 451, a rotating rod 452, a drive rod 453, a rotating gear 454, and a rotating rack 455. The rotating gear 454 is coaxially and fixedly connected to the moving gear 41 and rotatably connected to the scum collection tank 113. The rotating rack 455 is slidably connected to the outer wall of the scum collection tank 113 and meshes with the rotating gear 454. The body of the rotating motor 451 is fixedly connected to the outer wall of the scum collection tank 113. The output shaft of the rotating motor 451 is fixedly connected to one end of the rotating rod 452. The other end of the rotating rod 452 is rotatably connected to one end of the drive rod 453, and the other end of the drive rod 453 is rotatably connected to one end of the rotating rack 455.

[0034] After the rotating motor 451 is started, the output shaft of the rotating motor 451 drives the rotating rod 452 to rotate and drives the drive rod 453 to make the rotating rack 455 reciprocate, thereby realizing the rotation of the rotating gear 454, which in turn drives the moving gear 41 to rotate so as to complete the movement of the moving rack 43, the moving rod 42 and the slag cleaning plate 13.

[0035] Reference Figure 2 and Figure 5To ensure sufficient scraping effect of the cleaning plate 13 on the scraper 12 when it comes into contact with the scraper 12, two contact wheels 1121 are provided in the scum collection tank 113. The two contact wheels 1121 are located on opposite sides of the scraper 12. A connecting block 1122 is coaxially rotatably connected to each contact wheel 1121. The connecting block 1122 is rotatably connected to the corresponding side wall of the scum collection tank 113. A stop block 1123 is fixedly connected to the scum collection tank 113. In the direction of movement of plate 12, stop block 1123 is located behind connecting block 1122. A spring is fixedly connected to connecting block 1122, and the spring is fixedly connected to the side wall of scum collection tank 113. Under the action of the spring force, the contact wheel 1121 is located on the movement trajectory of connecting sub-plate 31, so that after scraper 12 passes the contact wheel 1121, scum cleaning plate 13 moves to the position of contacting scraper 12. At the same time, scraper 12 and contact wheel 1121 are in contact to maintain sufficient contact force between scum cleaning plate 13 and scraper 12. When scraper 12 is disengaged from contact wheel 1121, connecting spring 33 deforms significantly, thereby further ensuring sufficient contact force between scum cleaning plate 13 and scraper 12.

[0036] The treatment device also includes a sludge thickening tank. The sludge thickening tank is connected to the scum collection tank 113 of the softening sedimentation tank, the sedimentation tank of the flocculation sedimentation tank, the UASB tank, and the secondary sedimentation tank through pipelines. A sludge pump is connected to the pipelines so that the sludge thickening tank can collect sludge from the scum collection tank 113, the sedimentation zone of the flocculation sedimentation tank, the UASB tank, and the secondary sedimentation tank. The sludge thickening tank is connected to a water collection tank so that the supernatant from the sludge thickening tank can be returned to the water collection tank.

[0037] The implementation principle of the harmless treatment device for traditional Chinese medicine extraction wastewater in this application embodiment is as follows: after the wastewater is filtered by the bar screen, it enters the collection tank, and then sequentially enters the collection tank, softening sedimentation tank, flocculation sedimentation tank, pre-acidification adjustment tank, pH adjustment tank, UASB tank, biological contact oxidation tank, secondary sedimentation tank, aerated biological filter tank, and finally the treated wastewater enters the clear water tank.

[0038] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for harmless treatment of wastewater from traditional Chinese medicine extraction, characterized in that, It includes a water collection tank, a flocculation sedimentation tank, a pre-acidification and equalization tank, a UASB tank, a biological contact oxidation tank, a secondary sedimentation tank, an aerated biological filter, and a clear water tank, which are connected in sequence. A bar screen is installed at the inlet end of the water collection tank, a flocculation box is installed on the flocculation sedimentation tank, the flocculation box contains flocculant, and an adjustment box is installed on the pre-acidification adjustment tank, the adjustment box contains hydrolyzing acidifying bacteria. The treatment device also includes a sludge thickening tank, which is connected to the UASB tank, flocculation sedimentation tank and secondary sedimentation tank to collect sludge from the UASB tank, flocculation sedimentation tank and secondary sedimentation tank. The sludge thickening tank is connected to the inlet of the water collection tank to allow the supernatant in the sludge thickening tank to enter the water collection tank.

2. The device for harmless treatment of wastewater from traditional Chinese medicine extraction according to claim 1, characterized in that, The processing device further includes: A softening sedimentation tank is located between a water collection tank and a flocculation sedimentation tank, and the softening sedimentation tank is connected to the water collection tank and the flocculation sedimentation tank, and the softening sedimentation tank is also connected to a sludge thickening tank. The pH adjustment tank is used to adjust the pH of the filtrate from the drug residue to 7.0±0.

2. The pH adjustment tank is located between the UASB tank and the pre-acidification adjustment tank, and the pH adjustment tank is connected to the pre-acidification adjustment tank and the UASB tank.

3. The device for harmless treatment of wastewater from traditional Chinese medicine extraction according to claim 2, characterized in that, The softening sedimentation tank includes: The mixing zone is connected to the outlet of the water collection tank. A feeding box is provided on the mixing zone, and the feeding box contains an alkaline substance. The flocculation zone is connected to the mixing zone. A feeding box is provided on the flocculation zone, and the feeding box contains flocculant. The separation zone is used to remove flocs, and the separation zone is connected to the flocculation zone and the flocculation sedimentation tank.

4. The device for harmless treatment of wastewater from traditional Chinese medicine extraction according to claim 3, characterized in that, The separation zone employs a dissolved air flotation machine (1), which includes: The flotation tank (112) is connected to the flocculation zone, and the bottom of the flotation tank (112) is provided with a flotation base (14), and the flotation tank (112) is connected to a drain pipe. The scum collection tank (113) is connected to the air flotation tank (112); A scraper (12) is connected to the side wall of the flotation tank (112), and the scraper (12) is movable in a direction close to or away from the scum collection tank (113); The slag removal plate (13) is connected to the side wall of the slag collection tank (113) and abuts against the scraper (12); The side wall of the flotation tank (112) is provided with a transmission assembly (2) for driving the scraper (12) to move.

5. The device for harmless treatment of wastewater from traditional Chinese medicine extraction according to claim 4, characterized in that, The transmission assembly (2) is provided in two sets, with the two sets of transmission assemblies (2) respectively located on both sides of the scraper (12), and each transmission assembly (2) includes: There are two drive pulleys (21), both of which are rotatably connected to the side wall of the flotation tank (112), and the two drive pulleys (21) are respectively located at both ends of the flotation tank (112); The transmission pulley (22) is rotatably connected to the side wall of the scum collection tank (113), and the transmission pulley (22) is located on the side of the plane where the two drive pulleys (21) are located away from the horizontal plane of the flotation tank (112); The drive belt (23) is sleeved on the outside of the drive pulley (21) and the drive pulley (22). Both sides of the scraper (12) are connected to the corresponding side of the drive belt (23) through the connecting plate (3). The drive motor (24) is fixedly connected to the outer wall of the flotation tank (112), and the output shaft of the drive motor (24) is fixedly connected to one of the drive pulleys (21) on the same axis.

6. The device for harmless treatment of wastewater from traditional Chinese medicine extraction according to claim 5, characterized in that, The connecting plate (3) includes: Connecting subplate (31) is fixedly connected to scraper (12); The contact subplate (32) is rotatably connected to the connecting subplate (31), and the contact subplate (32) is rotatably connected to the transmission belt (23); A connecting spring (33) connects a connecting sub-plate (31) and an abutting sub-plate (32). Under the elastic force of the connecting spring (33), the abutting sub-plate (32) and the connecting sub-plate (31) are set at an angle.

7. The device for harmless treatment of wastewater from traditional Chinese medicine extraction according to claim 4, characterized in that, The slag removal plate (13) moves in a direction close to or away from the side wall of the flotation tank (112) and away from the slag collection tank (113). The side wall of the slag collection tank (113) is provided with a moving component (4) for driving the slag removal plate (13) to move back and forth.

8. The device for harmless treatment of wastewater from traditional Chinese medicine extraction according to claim 3, characterized in that, The flocculation sedimentation tank uses polyferric sulfate as a flocculant.

9. The device for harmless treatment of wastewater from traditional Chinese medicine extraction according to claim 1, characterized in that, The flocculation zone uses cationic PAM aqueous solution as flocculant.

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